Blac Chyna and Tyga
Blac Chyna shares a son, King Cairo Stevenson with former boyfriend TygaGetty

It hasn't been a month since Rob Kardashian and Blac Chyna announced the news of their engagement to the world and now it seems Chyna is pregnant with the Kardashian boy's child. However, this is not the first baby for Rob's model girlfriend; she already has a son, King Cairo Stevenson, with ex-boyfriend Tyga.

The situation gets all the more weird as Tyga is currently in a relationship with Rob's 18-year-old sister Kylie Jenner. According to a source close to the rapper, he was "shocked" to hear the news of his former lover's pregnancy.

The couple took to their favourite medium to announce their baby news, with 27-year-old Chyna posting an emoji picture of hers on Instagram with a baby bump clearly visible. Tyga couldn't help congratulating his former lady love.

The 26-year-old singer wrote "Congratulations" on Chyna's picture followed by a streamer emoji. However, if rumours are to be believed, Tyga is not pleased to learn that his girfriend's brother is soon going to become the father of his ex-girlfriend's child. With this latest addition and the baby on the block, the Kardashian-Jenner and now Chyna clan gets as complicated as ever.

A source told Hollywood Life: "Tyga's publicly supportive of Blac's pregnancy but behind closed doors, dude's shocked." The source further adds that Tyga cannot believe that Chyna actually pulled this off. "She literally just set herself up for life by getting pregnant with Rob's baby."

This is not the first time that Tyga has come out in the public with his concerns over Chyna's relationship with such a close family member. Earlier in April, the Rack City singer had tweeted expressing his concerns: "It makes me happy to see the mother of my son happy. My only concern in this situation is my son. I want him in happy environments."

While the father of Chyna's son surely needs time to adjust to the latest addition in the Kardashian-Jenner family, Rob's sisters, Kim Kardashian and Kylie both took their turn to like Chyna's animated pregnancy picture, seemingly throwing in some support for the pair. Hopefully, the baby news will help build bridges between Rob and Khloe Kardashian as well.

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A photo posted by www.Lashedbar.co (@blacchyna) on